KCET · Physics · Semiconductors
A positive hole in a semiconductor is
- A an anti-particle of electron
- B a vacancy created when an electron leaves a covalent bond
- C absence of free electrons
- D an artificially created particle
Answer & Solution
Correct Answer
(B) a vacancy created when an electron leaves a covalent bond
Step-by-step Solution
Detailed explanation
At room temperature, some of the valence electrons acquire thermal energy greater than \(E_{g}\) (energy gap between conduction and valence band ) and some of the valence electrons becomes free. Thus, we can say that a valence electron is shifted to conduction band leaving a vacancy of electron in valence.
This vacancy is known as hole and carries a positive charge.
This vacancy is known as hole and carries a positive charge.
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